Keiji Oyoshi

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Tsukuba, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method of forming optical waveguides by ion implantation
- Patent number 5,066,514
- Issue date Nov 19, 1991
- Nippon Sheet Glass Co., Ltd.
- Keiji Oyoshi
- G02 - OPTICS
Information Patent Grant
Method of preparing an alkali metal diffusion preventive layer
- Patent number 4,986,841
- Issue date Jan 22, 1991
- Nippon Sheet Glass Co., Ltd.
- Keiji Oyoshi
- C03 - GLASS MINERAL OR SLAG WOOL